Studies have shown that excessive exposure to sun can increase the risk of some cancers. The recent research has shown that lack of sunshine can increase the risk of heart disease and high blood pressure. Researchers from Marcella Niehoff School of Nursing at Loyola University in Chicago reviewed a number of earlier studies that linked chronic vitamin D deficiency to heart disease.

Analysis of data indicated 30 percent to 50 percent higher rate of severe heart disease or death in sun-deprived heart disease patients. The study also revealed that the lack of sunshine during winter may diminish vitamin D levels in the body and harm cardiovascular health.

Researchers said that diet alone is not sufficient to manage vitamin D levels. Treatment options, such as vitamin D2 or D3, may decrease the risk of severe heart disease or death. The preferred range in the body is 30-60 mg/mL of vitamin D.

Lead researcher, Sue Penckofer said, "Most physicians do not routinely test for vitamin D deficiency. However, most experts would agree that adults at risk for heart disease and others who experience fatigue, joint pain, or depression should have their vitamin D levels measured."

Researchers cautioned that one should not start Vitamin D supplements until a deficiency is diagnosed because an overdose of the vitamin may lead to vitamin D toxicity.